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In contrast to endurance workouts, which focus on brief, strong movements that are not repeated for extended periods of time, resistant exercises target rapid glycolytic fibers in muscles.
Strong muscular contractions are caused by the rapid ATP hydrolysis and cross-bridge generation in fast glycolytic fibers. As a result, muscles that are used for strength frequently contain a larger proportion of rapid glycolytic fibers than slow oxidative fibers. The diameter of muscle fibers increases as a result of resistance training boosting the production of myofibrils. Athletes attempting to increase their muscle mass frequently consume high levels of protein since this muscular growth is made possible by the addition of structural proteins. Resistance training can cause overuse injuries to the muscle, tendon, or bone if it is performed incorrectly. These injuries can happen if the load is too great, if the muscles don't have enough time to heal between sessions, or if the joints aren't properly positioned when doing the exercises. After vigorous exercise, muscle fibers sustain cellular damage, including harm to the sarcolemma and myofibrils. After intense exercise, injured muscles might make you feel painful, but when the damage is healed and new structural proteins are added to replace the ones that were lost, muscles develop bulk.
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